I checked.
It seems to be free for the first 300,000 queries per month, then switches to a regular DNS (no blocking). Unlimited queries are $1.99 per month.
It seems to be free for the first 300,000 queries per month, then switches to a regular DNS (no blocking). Unlimited queries are $1.99 per month.
EDIT: they accept cryptocurrencies, so the problem is slightly less critical.